Breast pump



FIG. 1 is a perspective view of a breast pump showing our new design;

FIG. 2 is an enlarged top plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a front elevational view thereof, the rear view being a mirror image;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a side elevational view thereof, the opposite side being a mirror image.

The broken line showing of the breast shield adaptor and the bottle are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a breast pump, as shown. 